4/16/2007 Declare a DTD File II 1

Declare A DTD File - II

4/16/2007 Declare a DTD File II 2

Define Reusable Text inside XML Files

• General entity– Can be referred to repeatedly inside an XML

document

– These two pages cover internal general entities

4/16/2007 Declare a DTD File II 3

Define Reusable Text inside XML Files

4/16/2007 Declare a DTD File II 4

Define Reusable Text inside XML Files

4/16/2007 Declare a DTD File II 5

Use Non-XML Data in XML Applications

• External data type– Any non-XML data type• Pictures, word-processing format files

• External general entity– A DTD construct used to resolve external data

types

4/16/2007 Declare a DTD File II 6

Use Non-XML Data in XML Applications

4/16/2007 Declare a DTD File II 7

Use Non-XML Data in XML Applications

4/16/2007 Declare a DTD File II 8

Use Non-XML Data in XML Applications

4/16/2007 Declare a DTD File II 9

Use Non-XML Data in XML Applications

4/16/2007 Declare a DTD File II 10

Use Non-XML Data in XML Applications

• No standard approach to specifying non-XML data using notations exists currently– Some like MIME– Some suggest URLs that point to standard

documents• Resources maintained by W3C

• Programmers are free to choose the approach that works best for their specific applications

4/16/2007 Declare a DTD File II 11

Embed Other Data in XML Applications

• Declare an external general entity to include an external data source (JPG, PDF) in XML-based application

• First declare a notation attribute. Then, declare external general entity

4/16/2007 Declare a DTD File II 12

Embed Other Data in XML Applications

4/16/2007 Declare a DTD File II 13

Embed Other Data in XML Applications

4/16/2007 Declare a DTD File II 14

Embed Other Data in XML Applications

• Define notation first

4/16/2007 Declare a DTD File II 15

Describe Namespace-Validation Rules

4/16/2007 Declare a DTD File II 16

Describe Namespace-Validation Rules

4/16/2007 Declare a DTD File II 17

Describe Namespace-Validation Rules

4/16/2007 Declare a DTD File II 18

Describe Namespace-Validation Rules

4/16/2007 Declare a DTD File II 19

Describe Namespace-Validation Rules